They can be used to buy Brawl Boxes, Brawlers, Brawler Skins, Token Doublers, Pins, Coins, PowerPoints, and the Brawl Pass.
Robo Rumble and Boss Fight are Ticket Events, Unlocked when you reach 300 trophies in Brawl Stars.
Tuning it down, but increasing base unload should allow for players to have a more interesting decisions when choosing what Star Power to bring, and also make him feel better without the Star Power.